Chapter 6

Question 1

Which of the following physical properties would be impossible to determine for a material in the gas state?

a. thermal expansion
b. viscosity
c. density
d. surface tension

Answer 1

d. surface tension

Question 2

What property of a liquid such as mercury is used in a liquid-in-glass thermometer?

a. density
b. compressibility
c. thermal expansion
d. more than one response is correct

Answer 2

c. thermal expansion

Question 3

Potential energy resulting from the attraction of particles

a. decreases when separation distance decreases
b. decreases when separation distance increases
c. increases when separation distance increases
d. more than one response is correct

Answer 3

d. more than one response is correct

Question 4

How does the kinetic energy of a particle change if the particle’s velocity is increased by a factor of 3?

a. kinetic energy increases by a factor of 3
b. kinetic energy decreases by a factor of 3
c. kinetic energy increases by a factor of 9
d. kinetic energy increases by a factor of 2

Answer 4

c. kinetic energy increases by a factor of 9

Question 5

You have a patient that is currently experience extreme discomfort after eating a large quantity of beans. The pain is being caused by the build up of gas pressure in the large intestines. If you were able to put a pressure gauge in to the patient, which of the following would be a reasonable pressure that you might observe.

a. 860 torr
b. 860 pounds per square inch
c. 860 pascal
d. 860 atmospheres

Answer 5

a. 860 torr

Question 6

Convert a temperature of 45°C into Kelvins.

a. −45 K
b. −228 K
c. 228 K
d. 318 K

Answer 6

d. 318 K

Question 7

Which of the following pressure units is largest?

a. one torr
b. one mm Hg
c. one psi
d. one atmosphere

Answer 7

d. one atmosphere

Question 8

Increasing the pressure on a gas at constant temperature does what to the volume of the gas?

a. increases
b. decreases
c. has no effect
d. increases up to a certain point

Answer 8

b. decreases

Question 9

2500 liters of oxygen gas is produced at 1.00 atm of pressure. It is to be compressed and stored in a 20.0 liter cylinder. If temperature is constant, calculate the pressure of the oxygen in the cylinder.

a. 125 atm
b. 4.0 atm
c. 80.0 atm
d. 8.00 atm

Answer 9

a. 125 atm

Question 10

A balloon has a volume of 5.00 liters of 22°C and 1.00 atmosphere of pressure. What will be the balloon’s volume in liters if the pressure is increased to 3.00 atmospheres at 22°C?

a. 1.67
b. 0.600
c. 1.30
d. 0.800

Answer 10

a. 1.67

Question 11

A 3.2 liter sample of gas is at 40°C and 1.0 atmosphere of pressure. If the temperature decreases to 20°C and the pressure decreases to 0.60 atmospheres, what is the new volume in liters?

a. 5.7
b. 5.0
c. 1.8
d. 0.20

Answer 11

b. 5.0

Question 12

A sample of gas collected at 21.0°C and a pressure of 660 torr has a volume of 1.83 liters. What volume in liters will the gas occupy at 38.0°C under a pressure of 500 torr?

a. 2.56
b. 4.37
c. 2.28
d. 1.33

Answer 12

a. 2.56

Question 13

A gas sample collected at 35.0°C and a pressure of 710 torr has a volume of 200 mL. The temperature and pressure are changed, and the gas is compressed to 150 mL. The new temperature is 40.0°C; what is the new pressure?

a. 1.27 atm
b. 1.08 × 103 torr
c. 541 torr
d. 0.712 atm

Answer 13

a. 1.27 atm

Question 14

Calculate the volume in liters of 3.50 moles of gas at STP.

a. 6.4
b. 44.8
c. 3.5
d. 78.4

Answer 14

d. 78.4

Question 15

What volume of ammonia gas, NH3, in liters is produced at STP by the complete reaction of 100 g of nitrogen, N2, with excess hydrogen?
     N2 + 3H2 → 2NH3
a.  74.7 
b.  747 
c.  62.5 
d.  160

Answer 15

d. 160

Question 16

A mixture of helium, argon and krypton is made and stored in a cylinder at a total pressure of 2.80 atm. The partial pressure of helium is 900 torr, and that of argon is 250 torr. What is the partial pressure of krypton in the mixture?

a. 1.18 atm
b. 1.51 atm
c. 1150 torr
d. 978 torr

Answer 16

d. 978 torr

Question 17

In which of the following processes does the energy of the water increase?

a. water freezes
b. steam condenses to liquid
c. water evaporates
d. more than one response is correct

Answer 17

c. water evaporates

Question 18

The temperature of a liquid is decreased. What happens to the vapor pressure of the liquid as a result?

a. it increases
b. it decreases
c. it is not changed
d. it increases or decreases depending on how large a temperature change occurs

Answer 18

b. it decreases

Question 19

Which of the following specific temperatures are defined in terms of vapor pressure?

a. boiling point
b. melting point
c. decomposition temperature
d. critical mass

Answer 19

a. boiling point

Question 20

When a liquid sample is taken from sea level to a higher elevation, what happens to the external (atmospheric) pressure on the liquid and the boiling point of the liquid?

a. both decrease
b. both increase
c. pressure goes down, but boiling point goes up
d. pressure goes up, but boiling point goes down

Answer 20

a. both decrease

Question 21

Ethylene dichloride is an effective cooling agent when allowed to evaporate. The heat of vaporization is 85.3 calories per gram. How much heat could be removed from the skin if 2.70 grams of ethylene dichloride were sprayed on and allowed to evaporate?

a. 31.6 cal
b. 230 cal
c. 0.00320 cal
d. 0.00400 cal

Answer 21

b. 230 cal

Question 22

The heat of fusion for zinc chloride is 40.4 calories per gram at the melting point of 275°C. How much heat is required to melt 500 g of zinc chloride at its melting point?

a. 11.1 kcal
b. 1.80 cal
c. 12.4 cal
d. 20.2 kcal

Answer 22

d. 20.2 kcal

Question 23

Given the following: heat of fusion of ice = 80.0 cal/g; specific heat of ice = 0.480 cal/g; and specific heat of water = 1.00 cal/g. Calculate the amount of heat required to melt 30.0 g of ice at 0°C.

a. 14.4 cal
b. 2.41 cal
c. 80.0 cal
d. 2.40 kcal

Answer 23

d. 2.40 kcal

Question 24

The heat of fusion of water is 80.0. What are the units associated with this number?

a. cal
b. cal / °C
c. cal / g°C
d. cal / g

Answer 24

d. cal / g

Question 25

The specific heat of ice is 0.48 cal/g°C. How much heat will it take to raise the temperature of 10 g of ice from −30°C to −20°C?

a. 0.48 cal
b. 4.8 cal
c. 48 cal
d. 10 cal

Answer 25

c. 48 cal